EP 1169715 A1 20020109 - X-RAY APPARATUS INCLUDING A FILTER PROVIDED WITH FILTER ELEMENTS HAVING AN ADJUSTABLE ABSORPTION
Title (en)
X-RAY APPARATUS INCLUDING A FILTER PROVIDED WITH FILTER ELEMENTS HAVING AN ADJUSTABLE ABSORPTION
Title (de)
RÖNTGENSTRAHLUNGSVORRICHTUNG MIT EINEM FILTEREINHEITEN MIT VERSTELLBARER ABSORPTIONSFÄHIGKEIT ENTHALTENDEN FILTER
Title (fr)
APPAREIL A RAYONS X COMPRENANT UN FILTRE POURVU D'ELEMENTS DE FILTRATION A ABSORPTION REGLABLE
Publication
Application
Priority
- EP 01913748 A 20010112
- EP 0100354 W 20010112
- EP 00300913 A 20000204
Abstract (en)
[origin: WO0157884A1] An X-ray apparatus with an X-ray source for producing a beam of X-rays, an X-ray detector for detecting the beam, and an X-ray filter with filter elements which is arranged between the X-ray source and the X-ray detector so as to attenuate the X-ray beam in each independent filter element individually. Each filter element can receive a liquid having electrically conducting properties and X-ray absorbing properties, the value of the X-ray absorption of the filter element being dependent on the level of the X-ray absorbing liquid in the filter element. Each filter element includes a first electrode (23) which is located in the wall of the filter element and on top of the substrate layer (38) in order to apply an electric potential to the wall of the filter element. A second electric potential is applied to the liquid via a second electrode. According to the invention the first electrode is segmented in the longitudinal direction z of the filter element in order to form the hold electrode segments (40) and barrier electrode segments (42) which form two corresponding electrode groups. The function of the hold segments (40) is to contain the liquid whereas the barrier segments (42) serve to produce potential barriers for the passage of the liquid in the longitudinal direction z of the filter element. An electrical device constantly supplies a voltage to the hold segments (40) via power lines (26') and switches (25'), which voltage suffices for filling the segments with the liquid. The same electrical arrangement applies a pulsed voltage to the barrier electrodes (42) via supply lines (26) and switches (25). The step-wise filling of the filter element is achieved by application of the voltage pulses to the barrier electrodes (40), thus enabling the passage of liquid through the barrier electrodes.
IPC 1-7
IPC 8 full level
G21K 3/00 (2006.01); A61B 6/00 (2006.01); G21K 1/10 (2006.01); G21K 5/02 (2006.01)
CPC (source: EP US)
G02B 26/005 (2013.01 - EP US); G21K 1/10 (2013.01 - EP US)
Citation (search report)
See references of WO 0157884A1
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 0157884 A1 20010809; EP 1169715 A1 20020109; JP 2003522329 A 20030722; US 2001043670 A1 20011122; US 6426999 B2 20020730
DOCDB simple family (application)
EP 0100354 W 20010112; EP 01913748 A 20010112; JP 2001557051 A 20010112; US 77584601 A 20010202